Perhaps you should try some spelling variations:
chieu sach » chinh sach, chieu sang, chieu xanh
hanh manh » hanh mang, lanh manh, hoang manh
dung cong » dung trong
luan phan » luan van, luan hoan
manh qua » manh quan, manh cua, danh qua
qua dung » quang dung, su dung, qua song
ban chat » van chat, bao chat, luan chat

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((chiet tach) OR (chieu sach)) - hanh manh qua dung cong ((ban chat) or (luan phan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chiet tach) OR (chieu sach)) - hanh manh qua dung cong ((ban chat) OR (luan phan)) cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chiet tach) OR (chieu sach)) - hanh manh qua dung cong ((ban chat) or (luan phan)) cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((chiet tach) OR (chieu sach)) - hanh manh qua dung cong ((ban chat) or (luan phan)) cao*.